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Showers & T-storms Overnight Into Monday AM; Isolated Showers Monday PM

Sunday climate report
Sunday climate report
Scott Derek

I was attending the American Weather Forums annual conference down near Baltimore-Washington Airport this weekend so I wasn't able to write up anything(I mean, I could have....BUT it's not often that I can mingle with other meteorologists and had to take advantage of the opportunity!); I did return back into the area by 4pm Sunday afternoon and let me tell you that from Baltimore along I-95 toward Philly/NJ I felt the heat and humidity creep up! It was in the lower 80s and mostly cloudy when I left and came back home to it being in the lower 90s, sunny, and also encountering dewpoints at or above 70! The official high at Philadelphia International Airport was 91 after a low of 72; there was some light rain this morning from a decaying Mesoscale Convective System, but by mid-morning the rain and clouds pushed offshore and we were left with a mostly stable(but humid) atmosphere.

Severe thunderstorms associated with a cold front are pushing eastward; high pressure will settle in for much of the upcoming work week

There are showers and thunderstorms to the west of Center City, but overnight we will have clouds as well as showers and thunderstorms(some strong to severe, but the severe weather threat should stay west of the I-95 corridor) with lows in the lower 70s; Monday morning may still have lingering showers until the morning commute ends and then as the cold front pushes away we'll have clearing by lunchtime once drier air tries to work in from the north. The issue is that there will be a trough behind the front that may spark off some showers and thunderstorms in the afternoon(they will be isolated in nature) as highs will be in the lower 80s. Hey, at least the humidity will be lower with falling dewpoints...BUT since there will still be some instability aloft with steep lapse rates(temperature change with height) that is why there will be the isolated shower threat in the afternoon.

The trough pushes away to the north and east on Tuesday, but meanders across Southern Canada; so it will pinwheel around some clouds come Wednesday and Thursday, but Tuesday it shall be just far enough north to give us a mostly sunny day with highs just in the lower 80s. Wednesday and Thursday will be in the middle 80s with partial sunshine.

Come Friday the cold front that's been hanging out offshore retrogrades a bit closer to the coast come Friday, but it's not until Saturday that we may see some showers or thunderstorms(especially along the coast) with highs ranging from the middle to upper 80s.

That's it for now, but you can check out the rest of the 7-day forecast at

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